<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <img src="../assets/icon/manage.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!--页面主体-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!--展开与收小-->
        <div class="toggle-btn" @click="toggleCollapse">{{ isCollapse ? '>>>' : '<<<' }}</div>
        <!--菜单组件-->
        <el-menu background-color="#333744" text-color="#fff"
                 active-text-color="#409eff" unique-opened :collapse="isCollapse"
                 :collapse-transition="false" router :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{ item.authName }}</span>
            </template>

            <!--二级菜单-->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id"
                          @click="saveNavState(subItem.path)">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>

          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧内容主体-->
      <el-main>
        <!--站位路由-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
'use strict'
export default {
  name: 'Home',
  data() {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      // 侧边栏是否折叠
      isCollapse: false,
      // 当前路由地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // console.log('退出登录')
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有菜单
    async getMenuList() {
      const {data: res} = await this.$http.get('menus')
      // console.log(res)
      // console.log(this.$route.path) 可以获取到当前的 path
      // $route 获取信息使用
      // $router 修改路由实例属性时使用
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.menuList = res.data
    },
    // 折叠与展开侧边栏
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存激活的子菜单
    saveNavState(activePath) {
      activePath = '/' + activePath
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
  font-size: 20px;

  > div {
    display: flex;
    align-items: center;

    span {
      padding-left: 10px;
    }
  }

  img {
    height: 50px;
  }


}

.el-aside {
  background-color: #333744;

  transition: width .5s;

  .el-menu {
    border: none;

  }
}


.el-main {
  background-color: #eaedf1;
}

.iconfont {
  padding-right: 5px;
}

.toggle-btn {
  background-color: #2c3e50;
  font-size: 13px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: .1em;

  user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -webkit-user-select: none;

  cursor: pointer;
}

.toggle-btn:hover {
  background-color: #304357;
}
</style>